Post Frost Biomass

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Successional fields are model ecosystems representing conversion of agricultural fields back to the natural vegetation. Successional systems have a potential to be used for cellulosic biofuels feedstock production. Use of successional systems for cellulosic biomass production requires measurements of harvestable biomass availability from these fields. We initiated such measurements by comparing biomass productivity at peak green biomass and post frost biomass, as measure of maximum and minimum harvestable biomass availability. Post frost biomass samples are taken after the air temperature as dipped below -2.2 C or 28 F at least once.

The pre frost biomass was derived from the non crop biomass by combining all of the species except ‘surface litter’ into the “UnSorted” category and summing the station biomass by species and then averaging over the stations to obtain a pre frost biomass estimate.

This datatable is part of the Annual Net Primary Production on the Main Cropping System Experiment dataset. Aboveground annual net primary production (ANPP) has been measured on the LTER main site since 1990 and on the successional and forested sites since 1993. ANPP is measured at peak biomass for a given treatment. In some systems with multiple harvests or complex communities that have peaks occurring at different times of the year, measurements are taken at multiple times per year. Additional ANPP measurements are made where appropriate using leaf litter traps, estimates of diameter from tree basal diameter and for the poplar treatment occasional destructive harvests. See the ANPP protocol for descriptions of the sampling and measurement methods for each of the treatments.


Experiment: Main Cropping System Experiment (MCSE)
Data available from: January 2008 to January 2018
Dataset: KBS019
Datatable ID: KBS019-023.97
Core Areas Primary Production
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Last Updated 2020-07-10
Variate Description Units
Year The year the sample was taken
campaign The name of the sampling campaign
pre frost sample date date of the pre frost sample
post frost sample date sample date of the post frost sample
treatment The Treatment sampled
replicate The replicate sampled
station the station within the plot that was sampled
species The species observed
pre frost biomass The peak harvestable biomass. g/m2
post frost biomass The harvestable biomass harvested after the frost g/m2
comments A comment on this data point

Data Excerpt

year campaign pre_frost_sample_date post_frost_sample_date treatment replicate station species pre_frost_biomass post_frost_biomass comments
2018 Post Frost Biomass 2018-08-01 2018-10-23 T7 R1 S1 Surface Litter 68.58 47.04
2018 Post Frost Biomass 2018-08-01 2018-10-23 T7 R1 S1 UnSorted 665.41 445.87
2018 Post Frost Biomass 2018-08-01 2018-10-23 T7 R1 S2 Surface Litter 98.27 77.12
2018 Post Frost Biomass 2018-08-01 2018-10-23 T7 R1 S2 UnSorted 776.26 557.67
2018 Post Frost Biomass 2018-08-01 2018-10-23 T7 R1 S3 Surface Litter 57.39 172.34
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